diff --git a/compiler/fir/java/src/org/jetbrains/kotlin/fir/scopes/jvm/JvmMappedScope.kt b/compiler/fir/java/src/org/jetbrains/kotlin/fir/scopes/jvm/JvmMappedScope.kt
index 88b79b675d6..065958a0e1a 100644
--- a/compiler/fir/java/src/org/jetbrains/kotlin/fir/scopes/jvm/JvmMappedScope.kt
+++ b/compiler/fir/java/src/org/jetbrains/kotlin/fir/scopes/jvm/JvmMappedScope.kt
@@ -22,6 +22,7 @@ import org.jetbrains.kotlin.fir.symbols.ConeTypeParameterLookupTag
 import org.jetbrains.kotlin.fir.symbols.impl.*
 import org.jetbrains.kotlin.fir.types.coneType
 import org.jetbrains.kotlin.fir.types.impl.ConeTypeParameterTypeImpl
+import org.jetbrains.kotlin.load.kotlin.SignatureBuildingComponents.inJavaLang
 import org.jetbrains.kotlin.name.CallableId
 import org.jetbrains.kotlin.name.Name
 
@@ -162,8 +163,7 @@ class JvmMappedScope(
         }
 
         // NOTE: No-arg constructors
-        @OptIn(ExperimentalStdlibApi::class)
-        private val additionalHiddenConstructors = buildSet<String> {
+        private val additionalHiddenConstructors = buildSet {
             // kotlin.text.String pseudo-constructors should be used instead of java.lang.String constructors
             listOf(
                 "",
@@ -185,13 +185,19 @@ class JvmMappedScope(
                 "Ljava/lang/Throwable;",
                 "Ljava/lang/String;"
             ).mapTo(this) { arguments -> "java/lang/Throwable.<init>($arguments)V" }
+
+            // TODO: remove after the end of getDeclaringClass/declaringClass deprecation period
+            add("java/lang/Enum.<init>(Ljava/lang/String;I)V")
         }
 
+        // TODO: remove after the end of getDeclaringClass/declaringClass deprecation period
+        private val additionalVisibleSignatures = inJavaLang("Enum", "getDeclaringClass()Ljava/lang/Class;")
+
         fun prepareSignatures(klass: FirRegularClass, isMutable: Boolean): Signatures {
 
             val signaturePrefix = klass.symbol.classId.toString()
             val visibleMethodsByName = mutableMapOf<Name, MutableSet<String>>()
-            JvmBuiltInsSignatures.VISIBLE_METHOD_SIGNATURES.filter { signature ->
+            (JvmBuiltInsSignatures.VISIBLE_METHOD_SIGNATURES + additionalVisibleSignatures).filter { signature ->
                 signature in JvmBuiltInsSignatures.MUTABLE_METHOD_SIGNATURES == isMutable &&
                         signature.startsWith(signaturePrefix)
             }.map { signature ->
diff --git a/compiler/testData/codegen/box/enum/declaringClassOnEnumObject.kt b/compiler/testData/codegen/box/enum/declaringClassOnEnumObject.kt
index 6a320c8e7e8..fe432994f48 100644
--- a/compiler/testData/codegen/box/enum/declaringClassOnEnumObject.kt
+++ b/compiler/testData/codegen/box/enum/declaringClassOnEnumObject.kt
@@ -1,6 +1,4 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_FIR: JVM_IR
-// FIR status: UNRESOLVED_REFERENCE (declaringClass). See https://youtrack.jetbrains.com/issue/KT-49653. To be discussed.
 package test
 
 enum class KEnum { A }
diff --git a/compiler/testData/diagnostics/tests/duplicateJvmSignature/finalMembersFromBuiltIns/enumMembers.fir.kt b/compiler/testData/diagnostics/tests/duplicateJvmSignature/finalMembersFromBuiltIns/enumMembers.fir.kt
index 8bc20f758b1..c83d2b1118f 100644
--- a/compiler/testData/diagnostics/tests/duplicateJvmSignature/finalMembersFromBuiltIns/enumMembers.fir.kt
+++ b/compiler/testData/diagnostics/tests/duplicateJvmSignature/finalMembersFromBuiltIns/enumMembers.fir.kt
@@ -1,6 +1,6 @@
 enum class E {
     ENTRY;
 
-    fun getDeclaringClass() {}
+    fun <!VIRTUAL_MEMBER_HIDDEN!>getDeclaringClass<!>() {}
     fun finalize() {}
 }
diff --git a/compiler/testData/diagnostics/tests/enum/declaringClass.fir.kt b/compiler/testData/diagnostics/tests/enum/declaringClass.fir.kt
index 4eda89068ed..7e3a26ceb51 100644
--- a/compiler/testData/diagnostics/tests/enum/declaringClass.fir.kt
+++ b/compiler/testData/diagnostics/tests/enum/declaringClass.fir.kt
@@ -4,6 +4,6 @@
 import java.util.*
 
 fun <E : Enum<E>> foo(values: Array<E>) {
-    EnumSet.noneOf(values.first().<!UNRESOLVED_REFERENCE!>declaringClass<!>)
-    EnumSet.noneOf(values.first().<!UNRESOLVED_REFERENCE!>getDeclaringClass<!>())
+    EnumSet.noneOf(values.first().declaringClass)
+    EnumSet.noneOf(values.first().getDeclaringClass())
 }
diff --git a/compiler/testData/diagnostics/tests/targetedBuiltIns/backwardCompatibility/finalize.fir.kt b/compiler/testData/diagnostics/tests/targetedBuiltIns/backwardCompatibility/finalize.fir.kt
index 914bf45c411..2c36055551c 100644
--- a/compiler/testData/diagnostics/tests/targetedBuiltIns/backwardCompatibility/finalize.fir.kt
+++ b/compiler/testData/diagnostics/tests/targetedBuiltIns/backwardCompatibility/finalize.fir.kt
@@ -1,7 +1,7 @@
 enum class TestEnum {
     ENTRY;
 
-    fun getDeclaringClass() {}
+    fun <!VIRTUAL_MEMBER_HIDDEN!>getDeclaringClass<!>() {}
     fun finalize() {}
 }
 
diff --git a/compiler/testData/ir/irText/classes/classes.fir.ir.txt b/compiler/testData/ir/irText/classes/classes.fir.ir.txt
index 33174690a15..47b88c9f4b5 100644
--- a/compiler/testData/ir/irText/classes/classes.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/classes.fir.ir.txt
@@ -121,3 +121,7 @@ FILE fqName:<root> fileName:/classes.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnumClass?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
diff --git a/compiler/testData/ir/irText/classes/enum.fir.ir.txt b/compiler/testData/ir/irText/classes/enum.fir.ir.txt
index 0e46e8b38c1..c26eb19688a 100644
--- a/compiler/testData/ir/irText/classes/enum.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/enum.fir.ir.txt
@@ -55,6 +55,10 @@ FILE fqName:<root> fileName:/enum.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum1?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:TestEnum2 modality:OPEN visibility:public superTypes:[kotlin.Enum<<root>.TestEnum2>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestEnum2
     CONSTRUCTOR visibility:private <> (x:kotlin.Int) returnType:<root>.TestEnum2 [primary]
@@ -129,6 +133,10 @@ FILE fqName:<root> fileName:/enum.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum2?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:TestEnum3 modality:ABSTRACT visibility:public superTypes:[kotlin.Enum<<root>.TestEnum3>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestEnum3
     CONSTRUCTOR visibility:private <> () returnType:<root>.TestEnum3 [primary]
@@ -190,6 +198,10 @@ FILE fqName:<root> fileName:/enum.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.TestEnum3
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum3?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum3?>? [fake_override] declared in <root>.TestEnum3
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     FUN name:foo visibility:public modality:ABSTRACT <> ($this:<root>.TestEnum3) returnType:kotlin.Unit
       $this: VALUE_PARAMETER name:<this> type:<root>.TestEnum3
     FUN ENUM_CLASS_SPECIAL_MEMBER name:values visibility:public modality:FINAL <> () returnType:kotlin.Array<<root>.TestEnum3>
@@ -235,6 +247,10 @@ FILE fqName:<root> fileName:/enum.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum3?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:TestEnum4 modality:ABSTRACT visibility:public superTypes:[kotlin.Enum<<root>.TestEnum4>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestEnum4
     CONSTRUCTOR visibility:private <> (x:kotlin.Int) returnType:<root>.TestEnum4 [primary]
@@ -317,6 +333,10 @@ FILE fqName:<root> fileName:/enum.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.TestEnum4
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum4?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum4?>? [fake_override] declared in <root>.TestEnum4
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     ENUM_ENTRY name:TEST2
       init: EXPRESSION_BODY
         ENUM_CONSTRUCTOR_CALL 'private constructor <init> () [primary] declared in <root>.TestEnum4.TEST2'
@@ -395,6 +415,10 @@ FILE fqName:<root> fileName:/enum.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.TestEnum4
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum4?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum4?>? [fake_override] declared in <root>.TestEnum4
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     FUN name:foo visibility:public modality:ABSTRACT <> ($this:<root>.TestEnum4) returnType:kotlin.Unit
       $this: VALUE_PARAMETER name:<this> type:<root>.TestEnum4
     FUN ENUM_CLASS_SPECIAL_MEMBER name:values visibility:public modality:FINAL <> () returnType:kotlin.Array<<root>.TestEnum4>
@@ -440,6 +464,10 @@ FILE fqName:<root> fileName:/enum.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum4?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:TestEnum5 modality:OPEN visibility:public superTypes:[kotlin.Enum<<root>.TestEnum5>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestEnum5
     CONSTRUCTOR visibility:private <> (x:kotlin.Int) returnType:<root>.TestEnum5 [primary]
@@ -514,6 +542,10 @@ FILE fqName:<root> fileName:/enum.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum5?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   FUN name:f visibility:public modality:FINAL <> () returnType:kotlin.Int
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun f (): kotlin.Int declared in <root>'
@@ -602,3 +634,7 @@ FILE fqName:<root> fileName:/enum.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum6?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
diff --git a/compiler/testData/ir/irText/classes/enumClassModality.fir.ir.txt b/compiler/testData/ir/irText/classes/enumClassModality.fir.ir.txt
index c9ffadb5b08..d5ec251f7d6 100644
--- a/compiler/testData/ir/irText/classes/enumClassModality.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/enumClassModality.fir.ir.txt
@@ -52,6 +52,10 @@ FILE fqName:<root> fileName:/enumClassModality.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestFinalEnum1?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:TestFinalEnum2 modality:OPEN visibility:public superTypes:[kotlin.Enum<<root>.TestFinalEnum2>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestFinalEnum2
     CONSTRUCTOR visibility:private <> (x:kotlin.Int) returnType:<root>.TestFinalEnum2 [primary]
@@ -118,6 +122,10 @@ FILE fqName:<root> fileName:/enumClassModality.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestFinalEnum2?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:TestFinalEnum3 modality:FINAL visibility:public superTypes:[kotlin.Enum<<root>.TestFinalEnum3>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestFinalEnum3
     CONSTRUCTOR visibility:private <> () returnType:<root>.TestFinalEnum3 [primary]
@@ -174,6 +182,10 @@ FILE fqName:<root> fileName:/enumClassModality.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestFinalEnum3?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:TestOpenEnum1 modality:OPEN visibility:public superTypes:[kotlin.Enum<<root>.TestOpenEnum1>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestOpenEnum1
     CONSTRUCTOR visibility:private <> () returnType:<root>.TestOpenEnum1 [primary]
@@ -231,6 +243,10 @@ FILE fqName:<root> fileName:/enumClassModality.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.TestOpenEnum1
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestOpenEnum1?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestOpenEnum1?>? [fake_override] declared in <root>.TestOpenEnum1
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     FUN ENUM_CLASS_SPECIAL_MEMBER name:values visibility:public modality:FINAL <> () returnType:kotlin.Array<<root>.TestOpenEnum1>
       SYNTHETIC_BODY kind=ENUM_VALUES
     FUN ENUM_CLASS_SPECIAL_MEMBER name:valueOf visibility:public modality:FINAL <> (value:kotlin.String) returnType:<root>.TestOpenEnum1
@@ -274,6 +290,10 @@ FILE fqName:<root> fileName:/enumClassModality.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestOpenEnum1?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:TestOpenEnum2 modality:OPEN visibility:public superTypes:[kotlin.Enum<<root>.TestOpenEnum2>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestOpenEnum2
     CONSTRUCTOR visibility:private <> () returnType:<root>.TestOpenEnum2 [primary]
@@ -333,6 +353,10 @@ FILE fqName:<root> fileName:/enumClassModality.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.TestOpenEnum2
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestOpenEnum2?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestOpenEnum2?>? [fake_override] declared in <root>.TestOpenEnum2
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     FUN name:foo visibility:public modality:OPEN <> ($this:<root>.TestOpenEnum2) returnType:kotlin.Unit
       $this: VALUE_PARAMETER name:<this> type:<root>.TestOpenEnum2
       BLOCK_BODY
@@ -379,6 +403,10 @@ FILE fqName:<root> fileName:/enumClassModality.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestOpenEnum2?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:TestAbstractEnum1 modality:ABSTRACT visibility:public superTypes:[kotlin.Enum<<root>.TestAbstractEnum1>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestAbstractEnum1
     CONSTRUCTOR visibility:private <> () returnType:<root>.TestAbstractEnum1 [primary]
@@ -438,6 +466,10 @@ FILE fqName:<root> fileName:/enumClassModality.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.TestAbstractEnum1
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestAbstractEnum1?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestAbstractEnum1?>? [fake_override] declared in <root>.TestAbstractEnum1
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     FUN name:foo visibility:public modality:ABSTRACT <> ($this:<root>.TestAbstractEnum1) returnType:kotlin.Unit
       $this: VALUE_PARAMETER name:<this> type:<root>.TestAbstractEnum1
     FUN ENUM_CLASS_SPECIAL_MEMBER name:values visibility:public modality:FINAL <> () returnType:kotlin.Array<<root>.TestAbstractEnum1>
@@ -483,6 +515,10 @@ FILE fqName:<root> fileName:/enumClassModality.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestAbstractEnum1?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS INTERFACE name:IFoo modality:ABSTRACT visibility:public superTypes:[kotlin.Any]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.IFoo
     FUN name:foo visibility:public modality:ABSTRACT <> ($this:<root>.IFoo) returnType:kotlin.Unit
@@ -559,6 +595,10 @@ FILE fqName:<root> fileName:/enumClassModality.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.TestAbstractEnum2
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestAbstractEnum2?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestAbstractEnum2?>? [fake_override] declared in <root>.TestAbstractEnum2
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     FUN ENUM_CLASS_SPECIAL_MEMBER name:values visibility:public modality:FINAL <> () returnType:kotlin.Array<<root>.TestAbstractEnum2>
       SYNTHETIC_BODY kind=ENUM_VALUES
     FUN ENUM_CLASS_SPECIAL_MEMBER name:valueOf visibility:public modality:FINAL <> (value:kotlin.String) returnType:<root>.TestAbstractEnum2
@@ -606,3 +646,7 @@ FILE fqName:<root> fileName:/enumClassModality.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestAbstractEnum2?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
diff --git a/compiler/testData/ir/irText/classes/enumWithMultipleCtors.fir.ir.txt b/compiler/testData/ir/irText/classes/enumWithMultipleCtors.fir.ir.txt
index 47c99bb1661..ed53d8e6b9e 100644
--- a/compiler/testData/ir/irText/classes/enumWithMultipleCtors.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/enumWithMultipleCtors.fir.ir.txt
@@ -92,6 +92,10 @@ FILE fqName:<root> fileName:/enumWithMultipleCtors.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.A
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.A?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.A?>? [fake_override] declared in <root>.A
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     ENUM_ENTRY name:Z
       init: EXPRESSION_BODY
         ENUM_CONSTRUCTOR_CALL 'private constructor <init> (x: kotlin.Int) declared in <root>.A'
@@ -220,3 +224,7 @@ FILE fqName:<root> fileName:/enumWithMultipleCtors.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.A?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
diff --git a/compiler/testData/ir/irText/classes/enumWithSecondaryCtor.fir.ir.txt b/compiler/testData/ir/irText/classes/enumWithSecondaryCtor.fir.ir.txt
index c8d5b9aa1ef..d79a8baf447 100644
--- a/compiler/testData/ir/irText/classes/enumWithSecondaryCtor.fir.ir.txt
+++ b/compiler/testData/ir/irText/classes/enumWithSecondaryCtor.fir.ir.txt
@@ -68,6 +68,10 @@ FILE fqName:<root> fileName:/enumWithSecondaryCtor.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Test0?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:Test1 modality:OPEN visibility:public superTypes:[kotlin.Enum<<root>.Test1>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Test1
     CONSTRUCTOR visibility:private <> (x:kotlin.Int) returnType:<root>.Test1 [primary]
@@ -141,6 +145,10 @@ FILE fqName:<root> fileName:/enumWithSecondaryCtor.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Test1?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:Test2 modality:ABSTRACT visibility:public superTypes:[kotlin.Enum<<root>.Test2>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Test2
     CONSTRUCTOR visibility:private <> (x:kotlin.Int) returnType:<root>.Test2 [primary]
@@ -222,6 +230,10 @@ FILE fqName:<root> fileName:/enumWithSecondaryCtor.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.Test2
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Test2?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Test2?>? [fake_override] declared in <root>.Test2
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     ENUM_ENTRY name:ONE
       init: EXPRESSION_BODY
         ENUM_CONSTRUCTOR_CALL 'private constructor <init> () [primary] declared in <root>.Test2.ONE'
@@ -285,6 +297,10 @@ FILE fqName:<root> fileName:/enumWithSecondaryCtor.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.Test2
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Test2?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Test2?>? [fake_override] declared in <root>.Test2
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     CONSTRUCTOR visibility:private <> () returnType:<root>.Test2
       BLOCK_BODY
         ENUM_CONSTRUCTOR_CALL 'private constructor <init> (x: kotlin.Int) [primary] declared in <root>.Test2'
@@ -334,3 +350,7 @@ FILE fqName:<root> fileName:/enumWithSecondaryCtor.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Test2?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
diff --git a/compiler/testData/ir/irText/declarations/annotations/classesWithAnnotations.fir.ir.txt b/compiler/testData/ir/irText/declarations/annotations/classesWithAnnotations.fir.ir.txt
index f15a987dfb2..3dbde84d46f 100644
--- a/compiler/testData/ir/irText/declarations/annotations/classesWithAnnotations.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/annotations/classesWithAnnotations.fir.ir.txt
@@ -181,6 +181,10 @@ FILE fqName:<root> fileName:/classesWithAnnotations.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ANNOTATION_CLASS name:TestAnnotation modality:OPEN visibility:public superTypes:[kotlin.Annotation]
     annotations:
       TestAnn(x = 'annotation')
diff --git a/compiler/testData/ir/irText/declarations/annotations/enumEntriesWithAnnotations.fir.ir.txt b/compiler/testData/ir/irText/declarations/annotations/enumEntriesWithAnnotations.fir.ir.txt
index c28468183df..2c4400b91b2 100644
--- a/compiler/testData/ir/irText/declarations/annotations/enumEntriesWithAnnotations.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/annotations/enumEntriesWithAnnotations.fir.ir.txt
@@ -102,6 +102,10 @@ FILE fqName:<root> fileName:/enumEntriesWithAnnotations.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.TestEnum
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum?>? [fake_override] declared in <root>.TestEnum
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     FUN ENUM_CLASS_SPECIAL_MEMBER name:values visibility:public modality:FINAL <> () returnType:kotlin.Array<<root>.TestEnum>
       SYNTHETIC_BODY kind=ENUM_VALUES
     FUN ENUM_CLASS_SPECIAL_MEMBER name:valueOf visibility:public modality:FINAL <> (value:kotlin.String) returnType:<root>.TestEnum
@@ -145,3 +149,7 @@ FILE fqName:<root> fileName:/enumEntriesWithAnnotations.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
diff --git a/compiler/testData/ir/irText/declarations/annotations/enumsInAnnotationArguments.fir.ir.txt b/compiler/testData/ir/irText/declarations/annotations/enumsInAnnotationArguments.fir.ir.txt
index ff16f87ea3b..41d393d52d3 100644
--- a/compiler/testData/ir/irText/declarations/annotations/enumsInAnnotationArguments.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/annotations/enumsInAnnotationArguments.fir.ir.txt
@@ -61,6 +61,10 @@ FILE fqName:<root> fileName:/enumsInAnnotationArguments.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.En?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ANNOTATION_CLASS name:TestAnn modality:OPEN visibility:public superTypes:[kotlin.Annotation]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestAnn
     CONSTRUCTOR visibility:public <> (x:<root>.En) returnType:<root>.TestAnn [primary]
diff --git a/compiler/testData/ir/irText/declarations/annotations/javaAnnotationWithSingleArrayArgument.fir.ir.txt b/compiler/testData/ir/irText/declarations/annotations/javaAnnotationWithSingleArrayArgument.fir.ir.txt
index 607a037801b..02da300ad53 100644
--- a/compiler/testData/ir/irText/declarations/annotations/javaAnnotationWithSingleArrayArgument.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/annotations/javaAnnotationWithSingleArrayArgument.fir.ir.txt
@@ -83,6 +83,10 @@ FILE fqName:<root> fileName:/C.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.E?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ANNOTATION_CLASS name:Annos modality:OPEN visibility:public superTypes:[kotlin.Annotation]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Annos
     CONSTRUCTOR visibility:public <> (value:kotlin.Array<<root>.Anno>) returnType:<root>.Annos [primary]
diff --git a/compiler/testData/ir/irText/declarations/multiplatform/expectedEnumClass.fir.ir.txt b/compiler/testData/ir/irText/declarations/multiplatform/expectedEnumClass.fir.ir.txt
index d1f70cf5ca1..7c0c5913331 100644
--- a/compiler/testData/ir/irText/declarations/multiplatform/expectedEnumClass.fir.ir.txt
+++ b/compiler/testData/ir/irText/declarations/multiplatform/expectedEnumClass.fir.ir.txt
@@ -49,6 +49,10 @@ FILE fqName:<root> fileName:/expectedEnumClass.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.MyEnum?>? [expect,fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ENUM_CLASS name:MyEnum modality:FINAL visibility:public superTypes:[kotlin.Enum<<root>.MyEnum>]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.MyEnum
     CONSTRUCTOR visibility:private <> () returnType:<root>.MyEnum [primary]
@@ -108,3 +112,7 @@ FILE fqName:<root> fileName:/expectedEnumClass.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.MyEnum?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
diff --git a/compiler/testData/ir/irText/expressions/enumEntryAsReceiver.fir.ir.txt b/compiler/testData/ir/irText/expressions/enumEntryAsReceiver.fir.ir.txt
index bf4ada43a6c..de3b45eff02 100644
--- a/compiler/testData/ir/irText/expressions/enumEntryAsReceiver.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/enumEntryAsReceiver.fir.ir.txt
@@ -84,6 +84,10 @@ FILE fqName:<root> fileName:/enumEntryAsReceiver.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.X
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.X?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.X?>? [fake_override] declared in <root>.X
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     PROPERTY name:value visibility:public modality:ABSTRACT [val]
       FUN DEFAULT_PROPERTY_ACCESSOR name:<get-value> visibility:public modality:ABSTRACT <> ($this:<root>.X) returnType:kotlin.Function0<kotlin.String>
         correspondingProperty: PROPERTY name:value visibility:public modality:ABSTRACT [val]
@@ -131,6 +135,10 @@ FILE fqName:<root> fileName:/enumEntryAsReceiver.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.X?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   FUN name:box visibility:public modality:FINAL <> () returnType:kotlin.String
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun box (): kotlin.String declared in <root>'
diff --git a/compiler/testData/ir/irText/expressions/enumEntryReferenceFromEnumEntryClass.fir.ir.txt b/compiler/testData/ir/irText/expressions/enumEntryReferenceFromEnumEntryClass.fir.ir.txt
index 6d925485829..00a00bcd9fc 100644
--- a/compiler/testData/ir/irText/expressions/enumEntryReferenceFromEnumEntryClass.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/enumEntryReferenceFromEnumEntryClass.fir.ir.txt
@@ -147,6 +147,10 @@ FILE fqName:<root> fileName:/enumEntryReferenceFromEnumEntryClass.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.MyEnum
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.MyEnum?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.MyEnum?>? [fake_override] declared in <root>.MyEnum
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     FUN ENUM_CLASS_SPECIAL_MEMBER name:values visibility:public modality:FINAL <> () returnType:kotlin.Array<<root>.MyEnum>
       SYNTHETIC_BODY kind=ENUM_VALUES
     FUN ENUM_CLASS_SPECIAL_MEMBER name:valueOf visibility:public modality:FINAL <> (value:kotlin.String) returnType:<root>.MyEnum
@@ -190,3 +194,7 @@ FILE fqName:<root> fileName:/enumEntryReferenceFromEnumEntryClass.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.MyEnum?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
diff --git a/compiler/testData/ir/irText/expressions/exhaustiveWhenElseBranch.fir.ir.txt b/compiler/testData/ir/irText/expressions/exhaustiveWhenElseBranch.fir.ir.txt
index d1365c7c234..6aa29fb80c4 100644
--- a/compiler/testData/ir/irText/expressions/exhaustiveWhenElseBranch.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/exhaustiveWhenElseBranch.fir.ir.txt
@@ -52,6 +52,10 @@ FILE fqName:<root> fileName:/exhaustiveWhenElseBranch.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.A?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   FUN name:testVariableAssignment_throws visibility:public modality:FINAL <> (a:<root>.A) returnType:kotlin.Unit
     VALUE_PARAMETER name:a index:0 type:<root>.A
     BLOCK_BODY
diff --git a/compiler/testData/ir/irText/expressions/objectAsCallable.fir.ir.txt b/compiler/testData/ir/irText/expressions/objectAsCallable.fir.ir.txt
index 64758652578..4cc77e06ee9 100644
--- a/compiler/testData/ir/irText/expressions/objectAsCallable.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/objectAsCallable.fir.ir.txt
@@ -71,6 +71,10 @@ FILE fqName:<root> fileName:/objectAsCallable.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.En?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   FUN name:invoke visibility:public modality:FINAL <> ($receiver:<root>.A, i:kotlin.Int) returnType:kotlin.Int [operator]
     $receiver: VALUE_PARAMETER name:<this> type:<root>.A
     VALUE_PARAMETER name:i index:0 type:kotlin.Int
diff --git a/compiler/testData/ir/irText/expressions/temporaryInEnumEntryInitializer.fir.ir.txt b/compiler/testData/ir/irText/expressions/temporaryInEnumEntryInitializer.fir.ir.txt
index 40294a46ae9..c77ee8ce836 100644
--- a/compiler/testData/ir/irText/expressions/temporaryInEnumEntryInitializer.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/temporaryInEnumEntryInitializer.fir.ir.txt
@@ -86,3 +86,7 @@ FILE fqName:<root> fileName:/temporaryInEnumEntryInitializer.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.En?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
diff --git a/compiler/testData/ir/irText/expressions/values.fir.ir.txt b/compiler/testData/ir/irText/expressions/values.fir.ir.txt
index 117b91ffe0f..2bbfd122533 100644
--- a/compiler/testData/ir/irText/expressions/values.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/values.fir.ir.txt
@@ -52,6 +52,10 @@ FILE fqName:<root> fileName:/values.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Enum?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS OBJECT name:A modality:FINAL visibility:public superTypes:[kotlin.Any]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.A
     CONSTRUCTOR visibility:private <> () returnType:<root>.A [primary]
diff --git a/compiler/testData/ir/irText/expressions/whenSmartCastToEnum.fir.ir.txt b/compiler/testData/ir/irText/expressions/whenSmartCastToEnum.fir.ir.txt
index 564d3b985ce..4057a9f35da 100644
--- a/compiler/testData/ir/irText/expressions/whenSmartCastToEnum.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/whenSmartCastToEnum.fir.ir.txt
@@ -58,6 +58,10 @@ FILE fqName:<root> fileName:/whenSmartCastToEnum.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.En?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.Unit
     BLOCK_BODY
       VAR name:r type:kotlin.String [var]
diff --git a/compiler/testData/ir/irText/firProblems/lambdaInEnumEntryConstructorCall.fir.ir.txt b/compiler/testData/ir/irText/firProblems/lambdaInEnumEntryConstructorCall.fir.ir.txt
index a7d42f2db4f..b5998b341f9 100644
--- a/compiler/testData/ir/irText/firProblems/lambdaInEnumEntryConstructorCall.fir.ir.txt
+++ b/compiler/testData/ir/irText/firProblems/lambdaInEnumEntryConstructorCall.fir.ir.txt
@@ -109,3 +109,7 @@ FILE fqName:<root> fileName:/lambdaInEnumEntryConstructorCall.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.ConfigurationParameter?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
diff --git a/compiler/testData/ir/irText/singletons/enumEntry.fir.ir.txt b/compiler/testData/ir/irText/singletons/enumEntry.fir.ir.txt
index 0a9f772ad2a..6efdfb6c8ef 100644
--- a/compiler/testData/ir/irText/singletons/enumEntry.fir.ir.txt
+++ b/compiler/testData/ir/irText/singletons/enumEntry.fir.ir.txt
@@ -81,6 +81,10 @@ FILE fqName:<root> fileName:/enumEntry.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.Z
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Z?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Z?>? [fake_override] declared in <root>.Z
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     FUN ENUM_CLASS_SPECIAL_MEMBER name:values visibility:public modality:FINAL <> () returnType:kotlin.Array<<root>.Z>
       SYNTHETIC_BODY kind=ENUM_VALUES
     FUN ENUM_CLASS_SPECIAL_MEMBER name:valueOf visibility:public modality:FINAL <> (value:kotlin.String) returnType:<root>.Z
@@ -124,3 +128,7 @@ FILE fqName:<root> fileName:/enumEntry.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.Z?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>